Terrible accounts department!

I had an op at Life Hospital St Georges and was very happy with the health care there but it was ruined by the terrible attitude of the accounts department. They send me a letter saying I owe the R1700 and must pay it. I rep**** that I'd like a copy of the account to see what its for. I had no reply to my email but have continued to receive threatening letters from the accounts department demanding payment. I have responded to each of these requesting a copy of the account and they still do not reply to my email or send me the account. I am happy to pay it if I owe them the money but it is my right to see an invoice or account showing what its for but not according to the accounts department at St Georges Life Hospital. They even sent one email saying "dont think that because you didn't answer your phone that you can hide from us" I'm currently overseas so cant get calls from SA. It is just absurd that they refuse to reply to me and send the account. The last correspondence was that they have handed it over for collection. What a waste of time and money. JUST SEND ME THE BILL!!! so I can see what you are charging me for as is my right.